The Public Trustee may borrow moneys on the security of any land so granted to, or acquired or held by, the Public Trustee and on the security of any buildings, improvements, and materials thereon, and shall from time to time, as the Public Trustee thinks fit, make advances out of such moneys to Voluntary Workers' Associations for the purchase of materials for constructing buildings and effecting improvements by voluntary labour on such land for homes for disabled members of the forces and dependents.